| 半干旱草原温室气体排放/吸收与环境因子的关系研究 |
| |
| 作者姓名： | WANG Yuesi HU Yuqiong JI Baoming LIU Guangren XUE Min |
| |
| 作者单位： | [1]StateKeyLaboratoryofAtmosphericBoundaryLayerPhysicsandAtmosphericChemistry,InstituteofAtmosphericPhysics,ChineseAcademyofSciences,Beijing100029 [2]InstituteofBotany,ChineseAcademyofSciences,Beijing100093 |
| |
| 基金项目： | This work was supported by
the grant of the Knowledge Innovation Program of Chi-
nese Academy of Sciences(approved # KZCX1SW-01).
The authors would like to thank Dr.DU Rui, Wang Yan-
fen,and Professor Zhang Wen,Wang Gengchen,and Wang
Mingxing for t |
| |
| 摘 要： | 静态箱—气相色谱法对内蒙古半干旱草原连续两年的实验观测研究结果表明，内蒙古草原是大气CO2和N2O的排放源，和CH4的汇。在植物生长不同季节，草原生态系统排放／吸收温室气体CO2、CH4和N2O的日变化形式各有不同，其中在植物生长旺季日变化形式最具特征。三种温室气体的季节排放／吸收高峰主要出现在土壤湿度较大的春融期和降雨较为集中时期。对所有草原植物生长季节，CO2净排放日变化形式均为白天出现排放低值，夜间出现排放高值。较高的温度有利于CO2排放，地上生物量决定着光合吸收CO2量值的高低。影响半干旱草原吸收CH4和排放N2O日变化形式的关键是土壤台水量和供氧状况，日温变化则主要影响日变化强度。吸收CH4和排放N2O的季节变化与土壤湿度季节变化分别呈线性反、正相关，相关系数均在0．4-0．6之间。自由放牧使CO2、N2O和CH4交换速率日较差降低，同时使N2O和CH4年度排放／吸收量减少和CO2年度排放量增加。
|
| 关 键 词： | 半干旱草原 温室气体排放 吸收 静态箱－气相色谱法 内蒙古 植物生长 日变化 二氧化碳 甲烷 一氧化二氮 日温变化 土壤湿度 |
An Investigation on the Relationship Between Emission/Uptake of Greenhouse Gases and Environmental Factors in Serniarid Grassland |
| |
| WANG Yuesi,HU Yuqiong,JI Baoming,LIU Guangren,XUE Min.An Investigation on the Relationship Between Emission/Uptake of Greenhouse Gases and Environmental Factors in Serniarid Grassland[J].Advances in Atmospheric Sciences,2003,20(1):119-127. |
| |
| Authors: | Yuesi Wang Yuqiong Hu Baoming Ji Guangren Liu Min Xue |
| |
| Institution: | State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Botany, Chinese Academy of Sciences, Beijing 100093,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
| |
| Abstract: | Measurements of greenhouse gases CO2, CH4, and N2O were made by static chamber-gas chromato-graph in Inner Mongolia. Results indicate that with growing seasons, the daily variation patterns ofemission/uptake of greenhouse gases differ greatly in the prairie ecosystem. The peak of seasonal emis-sion/uptake of three greenhouse gases occurs at the melting period in spring when soil moisture is highand rainfall is rich. The daily emissions of CO2 from steppe vegetation in growing seasons are low duringthe daytime and high at night. Higher temperatures are advantageous to emission of CO2, as abovegroundbiomass determines the amount of CO2 photosynthetic uptake. The key factors that influence the dailyvariation patterns of CH4 uptake and N2O emission in semiarid grassland are soil moisture and the oxygensupplying condition, while the changes in daily temperature mainly affect the range of daily variations.The seasonal changes of N2O emission are positively related to seasonal change in soil moisture. Freegrazing reduces the daily mean deviation of exchange rates of CO2, N2O, and CH4, but it decreases theamount of annual emission/uptake of N2O and CH4 yet it increases the annual emission of CO2. |
| |
| Keywords: | variation temperature moisture emission/uptake CO2 CH4 N2O |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ |
| 点击此处可从《大气科学进展》浏览原始摘要信息 |
| 点击此处可从《大气科学进展》下载免费的PDF全文 |
|
